package climbStairs70;

public class ClimbStairs {
    public int climbStairs(int n) {
        int[] dp = new int[n+1];//防止dp[n] 越界
        dp[0] = 1;
        dp[1] = 1;
        for (int i = 2; i <=n ; i++) {
            dp[i] = dp[i - 1] + dp[i - 2];
        }
        return dp[n];
    }

    public static void main(String[] args) {
        ClimbStairs climbStairs = new ClimbStairs();
        System.out.println(climbStairs.climbStairs(3));
    }

}
